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What is the size of an electron?

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Curiously, this most common of atomic parts has only a fuzzy estimate of size.
Linus Pauling says "The radius of the electron has not been determined exactly, but it is known to be less than 1 X 10-13 cm".
So roughly the electron is 1/1000 the size of a proton. Maybe. But a cooler answer is-- physicists are annoyed by the question. A good case can be made for other sizes, even huge sizes....because the properties of the electron OTHER than it's size are the ONLY important ones. In fact the size of atomic pieces smaller than the nucleus usually does not matter at all....and may in fact have no meaning. After all, how do you propose to measure these guys?


The electron is known to be a point particle down to a limit of 10^-18m. It, as far as we know does not have a classical "size".
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What is the size of protons compared to electrons?

Protons have a diameter of 1.6 to 1.7×10−15 meters. The electron is known to be a point particle up to an upper limit of 10-18 m. It does not conventionally have a size.

What is the size of a proton neutron and electron?

The electron is the smallest having about 1/1836th the mass of a proton or neutron, which means that basically an electron has no mass. The neutron and proton weigh the same b

How does the size of an electron compare to that of a proton?

It is difficult to compare the size of particles so small. Subatomic particles are not really like little balls. They exhibit particle properties but also wave properties. The

What is the size of a electron microscope?

Size can vary from a small scanning electron microscopes (SEM), about the size of a tower PC case that sits on a table top, to a million volt transmission electron microscopes

Does a electron cloud have a specific size?

It is impossible to know exactly where an electron is. Thus, the size of an electron cloud can be given only in terms of probability. Even then, the size of the electron cloud

Is one electron the same exact size as the other electron?

All electrons are created equal. "Size" is a more difficult concept than you might expect when it comes to dealing with particles small enough for quantum, rather than Newton